He was about to walk into the Bayonne home where he had once lived with his wife and two daughters and begin shooting. Then he would shoot himself.

In the hand-written note, the 28-year-old said he was despondent over a six-month separation from his wife, Kenia and didn’t want to live anymore.

And, authorities say, he had no reservations about killing others inside.

Opening fire as he stalked the first floor of the ranch-style home on Avenue A Monday evening, Collado shot his wife, her boyfriend and the boyfriend’s 14-month old son, firing 20 rounds, almost all of them hitting their mark. Each victim was hit multiple times in the head, torso and limbs.

Then he went to the basement and confronted his daughters, ages 6 and 8. Had police not arrived, authorities say, the girls likely would have met the same fate.

"I think you could infer that (his daughters) were at risk … it isn’t stated but I think that they were at risk … it might have been that he was in fact distracted by the arrival of the police," Hudson County Prosecutor Edward DeFazio said.

The note, more than a page long, was discovered early Wednesday inside Collado’s 2004 Nissan Maxima, which was parked in the shadow of the Bayonne Bridge, not far from the Avenue A home.

DeFazio said the motive behind the killings appears to be the collapse of the Collados’ eight-year marriage, and Adepso Collado’s growing despair.

"It’s clear from the note that it was the disintegration of their relationship that put this in motion," the prosecutor said.

Though no one was mentioned by name, DeFazio said it was obvious Collado’s wife and children were at risk.

"Once he went about this … once he initiated this action, it appears that everybody was an intended victim," DeFazio said.

Collado arrived at the home, unannounced, at around 7:30 p.m. and began arguing with his estranged wife and her new boyfriend, Jose Guzman, DeFazio said.

The argument quickly turned bloody.

Collado shot Guzman and Guzman’s 14-month-old son, Matthew several times, authorities said. Then he fired on a 25-year-old woman, described by friends as Kenia Collado’s roommate, hitting her in the arm before she ran, screaming from the house.

Friend remembers murder victim Kenia Collado.Walda Jiminez remembers her friend Kenia Collado who was killed in a Bayonne murder-suicide. Jiminez worked with both Collado and her estranged husband Adepso Collado, who has been identified as the gunman.

Kenia Collado was shot in the bedroom seconds later before Collado made his way to the basement — where he confronted his daughters.

Collado reportedly asked the girls if they wanted "to go to heaven or go to hell," according to an account relayed to The Star-Ledger by two of Kenia Collado’s friends. DeFazio has said the word "hell" was not used, but confirmed a similar conversation took place.

But as police closed in, Collado turned the gun on himself, sparing the girls.

Though he wouldn’t reveal details of the suicide note, DeFazio said it was coherent.

"Frankly, it was described as being written by somebody who seemingly was an intelligent person," DeFazio said.

The note mentioned Collado’s youngest daughter was going on vacation to the Dominican Republic, leading investigators to determine it was written "recently."

The note does not square with the pleasant persona friends and coworkers describe. Collado was a phlebotomist who was employed by EZ Clinical Laboratory in East Brunswick. A co-worker, who asked not to be identified, said he was upbeat when they spoke last week, and looking forward to a company social event.

"He said, ‘it will be nice to see you,' " she said.

Sylvia Pagulayan, an internist two floors below where Collado worked for EZ Clinical Laboratory, said Collado was like a son to her.

Mark Dye/The Star-LedgerDr. Syliva Pagulayan who employed Adepso Collado, 28, who shot his estranged wife, Kenia Collado, 26, Jose Guzman, 31, and a 14 month old child before turning the gun on himself on the evening of Monday Dec. 5.

"He is the nicest man I’ve ever seen," she said, her eyes filling with tears. "It’s not my Adepso. I always call him ‘my Adepso.’ He’s like my son."